#include <stdio.h>

int sum(int start,int end)
{
    int result = 0;
    for(int i = start; i <= end; i ++)
    {
        result += i;
    }
    return result;
}

int main()
{
    int start = 1;
    int end = 100;
    printf("I will start");

    int n = sum(start,end);

    printf("running done , result is : [%d-%d] = %d\n",start,end,n);
    return 0;
}
